J. R. Cox, Jr., M. Gaddis, and J. S. Turner. "Project Zeus: Design of a Broadband Network and its Application on a University Campus," IEEE Network, pp. 20-30, March 1993.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....[54] processes the video and audio streams, and no data copying is required. Any extra information added to the data stream beyond the raw data is introduced by the codec for use in the audio and video algorithms. 3. 4 Background Vaudeville was built using the Project Zeus ATM testbed[7] and the MultiMediaExplorer (MMX) 54,56] The MMX is an ATM desktop multimedia hardware interface. We use the ATM testbed to allow us to transmit audio and video between MMXs. Both audio and video are compressed, decompressed and displayed by the MMX. To control these two pieces, we introduce two ....

....different media. A collection of channels is managed as a session. Sessions are started by a separate process, a moderator. To save a type of session or a set of applications in the session, a new moderator is created to spawn that particular type of session. Collaboration transparent systems[49,7] usually abstract out a set of general services needed by a large class of collaborative applications and then offer a set of primitives to the application developer to allow him to take advantage of these services. This is the approach we chose to take, although Vaudeville does not prohibit a ....

J. R. Cox, Jr., M. Gaddis, and J. S. Turner. "Project Zeus: Design of a Broadband Network and its Application on a University Campus," IEEE Network, pp. 20-30, March 1993.

....bit rate. The required buffer bandwidth is allocated to the connection for the whole burst duration and released after the completion of the burst. In both schemes, only the burst that would cause congestion to arise is dropped, while the rest of the bursts are not affected. The FBR scheme [10, 50] associates with each virtual circuit a share of the cell slots that is equal to the ratio of the peak rate of the source to the link rate. Acceptance or rejection of cells is performed on a burst basis. If upon the arrival of a burst the number of buffer slots associated with the source is ....

....has extensively been used in literature [4, 15, 16, 50] Another common technique involves the use of recursive equations to calculate the new values of quantities involved in CAC when a new call requests connection or when a call is disconnected. Examples of recursive algorithms can be found in [4, 10, 15, 16, 19, 50]. Finally, in terms of techniques to reduce the computational complexity, an approach which assumes that the multiplexors are bufferless is proposed in [19] This assumption dramatically reduces the amount of computations that needs to be performed, thus making real time implementations possible. ....

J. Cox, J. Turner "Project Zeus: Design of a Broadband Network and its Application on a University Campus", Washington University in St. Louis, Technical Report WUCS 91-45.

....logical connections among the GUI module boundary and the boundaries of other modules in the system in order to configure a complete customized distributed application. The development work is being conducted in the context of an ATM network being deployed on the Washington University campus [3]. 1.3 Overview The remainder of this paper is organized as follows. In Section 2, we provide an overview of related work. We present our visual communication language in the context of an air traffic control example introduced in Section 3. Section 4 discusses visual specification of ....

Jerome R. Cox, Jr., Mike Gaddis, and Jonathan S. Turner. Project Zeus: Design of a broadband network and its application on a university campus. IEEE Network, pages 20--30, March 1993.

....user interfaces for distributed applications[11] are also supported. An undergraduate course in distributed application paradigms has been taught using Playground as the programming environment. Also, Playground has been used to implement a video conferencing application on top of an ATM network [2] built at Washington University. The system is based on a new high level approach to interprocess communication. Functional components of a concurrent system are written as encapsulated application programs that act upon local data structures, some of which may be published for external use. ....

Jerome R. Cox, Jr., Mike Gaddis, and Jonathan S. Turner. Project Zeus: Design of a broadband network and its application on a university campus. IEEE Network, pages 20--30, March 1993.

....offered average load is 100 Mbps, the peak offered load is 800 Mbps, which is well over the fddi link bandwidth of 100 Mbps. For a transient period this can strain the gateway hardware significantly. Such high peak to average ratios will be be common in high bandwidth applications of the future [2]. The gateway throughput performance for different peak to average ratios is plotted in Figure 8 (A) Observe that for high loads, the throughput is lower for higher peak to average ratios due to the increased frame and cell loss. The dependence of cell loss probability on the offered load for ....

Cox, J., and Turner, J., "Project Zeus: Design of a Broadband Network and its Application on a University Campus," Technical Report WUCS 91-45 , Department of Computer Science, Washington University in St. Louis, Missouri, 1991.

....audio and video variables were added to the Playground runtime library. If a connection is made between audio or video variables, the combined connection management system makes an ATM connection between the two sites. 1. 2 HARDWARE TESTBED Vaudeville was built using the Project Zeus ATM testbed[1] and the MultiMediaExplorer (MMX) 7] The MMX is an ATM desktop multimedia hardware interface that is host independent, and requires no computing resources from the host workstation for processing of multimedia streams. It is currently controlled over a RS 232. It allows users to simultaneously ....

Jerome R. Cox, Jr., Mike Gaddis, and Jonathan S. Turner. Project Zeus: Design of a Broadband Network and its Application on a University Campus. IEEE Network, pages 20-30, March 1993.

....offered average load is 100 Mbps, the peak offered load is 800 Mbps, which is well over the fddi link bandwidth of 100 Mbps. For a transient period this can strain the gateway hardware significantly. Such high peak to average ratios will be be common in high bandwidth applications of the future [Cox, 1991]. 40.0 60.0 80.0 100.0 120.0 140.0 Average ATM Bandwidth [Mbps] 40.0 50.0 60.0 70.0 80.0 90.0 100.0 P A=2 P A=4 P A=8 Figure 17: Throughput vs. Offered Load The gateway throughput performance for different peak to average ratios is plotted in Figure 17. Observe that for high loads, the throughput ....

Cox, J.R.Jr., Turner, J. (1991) `Project Zeus: Design of a Broadband Network and its Application on a University Campus' Technical Report WUCS 91-45 , Department of Computer Science, Washington University in St. Louis, Missouri.

....logical connections among the GUI module boundary and the boundaries of other modules in the system in order to configure a complete customized distributed application. The development work is being conducted in the context of an ATM network being deployed on the Washington University campus [3]. 1.3 Overview The remainder of this paper is organized as follows. In Section 2, we provide an overview of related work. We present our visual communication language in the context of an air traffic control example introduced in Section 3. Section 4 discusses visual specification of ....

Jerome R. Cox, Jr., Mike Gaddis, and Jonathan S. Turner. Project Zeus: Design of a broadband network and its application on a university campus. IEEE Network, pages 20--30, March 1993.

....network bandwidth for data transmission. Logical connections that have arbitrary fan out could be handled with multicast connections in the network. As a testbed for this work, we plan to use the high speed packet switched network that is being deployed on the Washington University campus [6]. The network, called Zeus, is based on fast packet switching technology that has been developed at Washington University over the past several years and is designed to support port interfaces at up to 2.4 Gb s. The Zeus network will allow us to implement multimedia applications that communicate ....

Jerome R. Cox, Jr., Mike Gaddis, and Jonathan S. Turner. Project Zeus: Design of a broadband network and its application on a university campus. IEEE Network, pages 20--30, March 1993.

.... previously developed [7] could also be created using tables defined by aggregate mappings (e.g. each participant of a conference is represented as a picture in an interactive table) This work is part of a project on construction of distributed multimedia applications on top of an ATM testbed [3]. 7.3 Module abstractions The module visual abstraction described in Section 2 is an intuitive mechanism for configuring Playground applications. However, for large applications it can become cumbersome to deal with many interconnected modules in this way. We have a number of enhancements to the ....

Jerome R. Cox, Jr., Mike Gaddis, and Jonathan S. Turner. Project Zeus: Design of a Broadband Network and its Application on a University Campus. IEEE Network, pages 20-30, March 1993.

....the past several years and is designed to support port interfaces at up to 2.4 Gb s. The Zeus network will support the 12 CHAPTER 1. THE PLAYGROUND PHILOSOPHY implementation of multimedia Playground applications that communicate using real time digital video and audio, as well as symbolic data. [1] I O abstraction encourages the use of proven software engineering techniques. Since each Playground module is written as an encapsulated unit, it is possible to reason about each module locally in terms of its well defined data interface. Since I O abstraction makes portions of the state of a ....

Jerome R. Cox, Jr., Mike Gaddis, and Jonathan S. Turner. Project Zeus: Design of a broadband network and its application on a university campus. IEEE Network, pages 20--30, March 1993.

....the biconnected components of a dynamically changing graph. Although the problem is a general one and is interesting in its own right, our particular motivation to study this problem arose as part of some work we are doing in conjunction with the ATM networking project at Washington University [6]. We are developing an abstraction and supporting software designed to simplify the construction of distributed multimedia applications [7] In our approach, called I O abstraction, each module has a presentation that consists of data structures that may be observed and or manipulated by its ....

Jerome R. Cox, Jr., Mike Gaddis, and Jonathan S. Turner. Project Zeus: Design of a broadband network and its application on a university campus. IEEE Network, pages 20--30, March 1993.

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J. Cox, M. Gaddis and J. Turner "Project Zeus: Design of a Broadband Network and its Application on a University Campus", IEEE Network Magazine, Vol. 7, No 2, Mar. 1993, pp. 20-30.

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J.R.Cox, J.S.Turner "Project Zeus: Design of a Broadband Network and its Application on a University Campus,"Technical Report WUCS 91-45, Department of Computer Science, Washington University in St. Louis, .

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